Dike design tool Wilma: a new, digital way to design
L. Tiggelman, J.N. Wierenga, R. Winter, Geotechnics No 1, March 2020, page 10
The dyke design tool Wilma on the VIKTOR platform is an updated design environment for the geotechnical consultant. The innovation consists of combining the smarts and insights of the designer and the infinite computing power of the computer through the platform. In the Wilmatool, the design software for the various design mechanisms is integrally linked and the data is centrally managed in line with the BIM philosophy. Full article
Determination of project-specific pile class factors with a rapid pile test
P. IJnsen, G. Meinhardt, A. van der Sluis, M. van Delft, Geotechniek No 1, March 2020, page 18
A special foundation concept will be used for the Adagio high-rise project in The Hague. The foundation will be installed from the existing basement with soil displacing, bolted steel tubular piles with relatively large pipe and point diameters. Full article
Evaluating and predicting settlement of high-rise buildings based on satellite data
F.J.M. Hoefsloot, W.R. Wiersma, Geotechniek No 1, March 2020, page 28
High-rise buildings in the western part of the country are subject to settlement due to compression of deep cohesive layers. The magnitude of compression and creep deformation depends on the load growth in the compressible layers determined by building dimensions, permanent load and foundation level. In addition, the properties of the compressible layers are important. A major uncertainty herein is the boundary stress or initial creep strain rate of these layers. Based on InSAR satellite data of existing high-rise buildings, the current subsidence rate can be measured and a good estimate can be made of the boundary stress in the compressible layers leading to the observed subsidence rate. Full article
Determining ground level subsidence is more than just geotechnical engineering
A.C.M. Kimenai, G. Bakker, L. Tiggelman, Geotechniek No 1, March 2020, page 36
For the 'Widening of the Wilhelminakanaal' project in Tilburg, a study was carried out on the effect of a groundwater level reduction on the surrounding area. One of the areas of concern was a possible expected ground level subsidence due to the groundwater level lowering and its impact on the built environment. In addition to a geotechnical analysis, an analysis of the soil processes that may occur in compressible layers was carried out. This showed that, on average, these processes can cause about 65% of total ground level subsidence. Full article
Design and construction of pile foundations up to 1991. Part 1 - the empirical period up to 1952
H. Keijer, Geotechnics No 1, March 2020, page 42
This article deals with the design and construction of pile foundations until 1991, when no standards existed for them. This first part covers the period up to 1952, when pile foundations were empirically designed. Full article
NGO lecture afternoon on sustainability
J.K. van Deen, Geotechnics No 1, March 2020, page 50
On 21 November 2019, the NGO organised a lecture afternoon in which a number of aspects of the topic of 'sustainability' were discussed: how sustainable is the insertion of geosynthetics into the ground and how do you communicate about it, how does RWS promote that its contractors contribute to RWS' sustainability ambitions and how does an engineering firm meet the challenge of circular design? Full article
Geogrid-anchored sheet piling, part 2: full scale test
P. van Duijnen, O. Detert, A. Lavasan, J. van den Berg, D. König, R. Hölter, S. van Eekelen, Geotechniek No 1, March 2020, page 53
During the construction of Wind Farm Krammer, the breakwalls around the lock complex were widened by using geogrids anchored sheet pile walls. At the site of one of the wind turbines, a triple geogrid-anchored sheet pile was test-loaded. The measured anchor forces in the geogrids and the displacements of the sheet piling are smaller than previously expected. Following the measurements, model tests are carried out in the Deltares laboratory. In this paper, the conducted test is analysed with a 2D analysis. Based on this, guidance is given on the design aspects of a sheet piling anchored with geogrids. Full article